ruby on rails -我怎么能期望特定的块调用特定的方法?

Question

我希望能够用rspec测试一个特定的gem调用一个特定的块:

代码如下所示

SomeGem.configure do |config|
  config.username = "hello"
  config.password = "world"
end

和我写的规范看起来像这样:

it 'sets valid gem configuration' do
  credentials = lambda do |config|
    config.username = "hello"
    config.password = "world"
  end
  expect(SomeGem).to receive(:configure).with(credentials)
end

我得到的错误:

Failure/Error: expect(SomeGem).to receive(:configure).with(credentials)
Wrong number of arguments. Expected 0, got 1.

关于我应该如何测试这个有什么想法吗?

Answer 1

我宁愿尝试断言外部可见的效果。假设您有一个可以用来检索配置值的SomeGem.configuration方法，那么您可以写入

describe 'configuration block' do
  subject do
    lambda do
      SomeGem.configure do |config|
        config.username = "hello"
        config.password = "world"
      end
    end
  end
  it { is_expected.to change(SomeGem.configuration, :username).to("hello") }
  it { is_expected.to change(SomeGem.configuration, :password).to("world") }
end